ipv6: Move ipv6 proc file registration to end of init order

/proc/net/ipv6_route reflects the contents of fib_table_hash. The proc
handler is installed in ip6_route_net_init() whereas fib_table_hash is
allocated in fib6_net_init() _after_ the proc handler has been installed.

This opens up a short time frame to access fib_table_hash with its pants
down.

Move the registration of the proc files to a later point in the init
order to avoid the race.

Tested :-)

Signed-off-by: Thomas Graf <tgraf@suug.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/ipv6/route.c b/net/ipv6/route.c
index 999a982..becb048 100644 (file)
--- a/net/ipv6/route.c
+++ b/net/ipv6/route.c
@@ -2957,10 +2957,6 @@ static int __net_init ip6_route_net_init(struct net *net)
        net->ipv6.sysctl.ip6_rt_mtu_expires = 10*60*HZ;
        net->ipv6.sysctl.ip6_rt_min_advmss = IPV6_MIN_MTU - 20 - 40;
 
-#ifdef CONFIG_PROC_FS
-       proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops);
-       proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
-#endif
        net->ipv6.ip6_rt_gc_expire = 30*HZ;
 
        ret = 0;
@@ -2981,10 +2977,6 @@ out_ip6_dst_ops:
 
 static void __net_exit ip6_route_net_exit(struct net *net)
 {
-#ifdef CONFIG_PROC_FS
-       proc_net_remove(net, "ipv6_route");
-       proc_net_remove(net, "rt6_stats");
-#endif
        kfree(net->ipv6.ip6_null_entry);
 #ifdef CONFIG_IPV6_MULTIPLE_TABLES
        kfree(net->ipv6.ip6_prohibit_entry);
@@ -2993,11 +2985,33 @@ static void __net_exit ip6_route_net_exit(struct net *net)
        dst_entries_destroy(&net->ipv6.ip6_dst_ops);
 }
 
+static int __net_init ip6_route_net_init_late(struct net *net)
+{
+#ifdef CONFIG_PROC_FS
+       proc_net_fops_create(net, "ipv6_route", 0, &ipv6_route_proc_fops);
+       proc_net_fops_create(net, "rt6_stats", S_IRUGO, &rt6_stats_seq_fops);
+#endif
+       return 0;
+}
+
+static void __net_exit ip6_route_net_exit_late(struct net *net)
+{
+#ifdef CONFIG_PROC_FS
+       proc_net_remove(net, "ipv6_route");
+       proc_net_remove(net, "rt6_stats");
+#endif
+}
+
 static struct pernet_operations ip6_route_net_ops = {
        .init = ip6_route_net_init,
        .exit = ip6_route_net_exit,
 };
 
+static struct pernet_operations ip6_route_net_late_ops = {
+       .init = ip6_route_net_init_late,
+       .exit = ip6_route_net_exit_late,
+};
+
 static struct notifier_block ip6_route_dev_notifier = {
        .notifier_call = ip6_route_dev_notify,
        .priority = 0,
@@ -3047,19 +3061,25 @@ int __init ip6_route_init(void)
        if (ret)
                goto xfrm6_init;
 
+       ret = register_pernet_subsys(&ip6_route_net_late_ops);
+       if (ret)
+               goto fib6_rules_init;
+
        ret = -ENOBUFS;
        if (__rtnl_register(PF_INET6, RTM_NEWROUTE, inet6_rtm_newroute, NULL, NULL) ||
            __rtnl_register(PF_INET6, RTM_DELROUTE, inet6_rtm_delroute, NULL, NULL) ||
            __rtnl_register(PF_INET6, RTM_GETROUTE, inet6_rtm_getroute, NULL, NULL))
-               goto fib6_rules_init;
+               goto out_register_late_subsys;
 
        ret = register_netdevice_notifier(&ip6_route_dev_notifier);
        if (ret)
-               goto fib6_rules_init;
+               goto out_register_late_subsys;
 
 out:
        return ret;
 
+out_register_late_subsys:
+       unregister_pernet_subsys(&ip6_route_net_late_ops);
 fib6_rules_init:
        fib6_rules_cleanup();
 xfrm6_init:
@@ -3078,6 +3098,7 @@ out_kmem_cache:
 void ip6_route_cleanup(void)
 {
        unregister_netdevice_notifier(&ip6_route_dev_notifier);
+       unregister_pernet_subsys(&ip6_route_net_late_ops);
        fib6_rules_cleanup();
        xfrm6_fini();
        fib6_gc_cleanup();